CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss) from Cont Ops	$ 79	$ 73	$ (366)
Net earnings (loss) from Disc Ops	0	0	(35)
Net earnings (loss)	79	73	(401)
OCI, net of tax:
Foreign currency translation adjustment	99	(27)	(38)
Ownership share of equity method investees' OCI	(7)	31	(2)
DB plan adjustments	2	5	101
Unrealized gain (loss) on hedges	0	(7)	(9)
Total OCI, net of tax	94	2	52
Comprehensive income (loss)	173	75	(349)
Less: Comprehensive income (loss) attributable to NCI	(63)	(47)	40
Comprehensive income (loss) attributable to Fluor	$ 236	$ 122	$ (389)